Telemetering system and apparatus



s Sheets-Sheet 1 Filed March 16, 1953 Nov. 26, 1957 E. A. HOSMER ETAL TELEMETERING SYSTEM AND APPARATUS 8 sheets-Sheet 2 Filed March 16. 1953 /NVEN7'OR5 A/berf E. JUI'S Jr.

5. H BY 0/53/ 557 A. Jig 55F fiYTTORNEY Nov. 26, 1957 E. A. HOSMER El AL I TELEMETERING SYSTEM AND APPARATUS 8 Sheets-Sheet 3 Filed March 16, 1953 ATTOR/VE Y5 Nov. 26, 1957 A. HOSMER ETAL 2,814,798

TELEMETERING SYSTEM AND APPARATUS Filed March 16. 1953 s Sheets-Sheet 4 mHH-HHH my 7 9 v Q mm m II In mi 1 1L ma QQ m RQ MM Q QQKQ g 3 mm mm \s w? m@ S N: g Q Q 3 vs Q 4% wwi 5 NE 5 g ATTORNEYS 1957 E. A. FIOSMER EIAL 2,814,793

' TELEMETERING SYSTEM AND APPARATUS Filed March 16, 1953 8 Sheets-Sheet 5 Tax ATTORNE Y5 NOV. 26, E. HQSMER El AL TELEMETERING SYSTEM AND APPARATUS 8 Sheets-Sheet 6 Filed March 16, 1953 Jack BY E//5w0rf 5% Nov. 26, 1957 E. A. HOSMER E TELEMETERING SYSTEM AND APPARATUS 8 Sheets-Sheet 8 Filed March 16. 1953 atent fiice Patented Nov. 26, 1957 2,814,798 TELEMETERING SYSTEM AND APPARATUS Ellsworth Albert Hosmer, Kenwood, Jack S. Hawley,

Oakland, and Albert E. Jurs, Jr., Berkeley, Calif., assignors, by mesne assignments, to Shand and Jurs Company, Berkeley, Calif., a corporation of California Application March 16, 1953, Serial No. 3 42,4532

22 Claims. (Cl. 340-359) This invention relates generally to telemetering systems and apparatus, and particularly to pulse transmitters for use in such'systems.

In many instances it is desirable to position an indicator or other member at a receiving Station in accordance with the positioning of a member at a remote transmitting station. By Way of example, a member at the transmitting station may be positioned in accordance with the location of a float in a liquid tank, and such position indicated at the remote station. In other instances it may be desirable to secure remote readings of temperatures, pressure, flow rates, and like data, to facilitate control of industrial processing operations, or to effect control operations automatically. Telemetering systems making use of regularly spaced control pulses have many desirable characteristics for industrial applications, particularly in that such systems permit use of relatively simple pulse generating equipment and relatively simple step by step operating means at the receiving station for the positioning of an indicator or like member in accordance with the number of received pulses. Such a pulse telemetering system is disclosed in co-pending application Serial No. 307,444, filed September 2, 1952, now Patent No. 2,748,373, in the name of E. A. Hosmer. One problem involved in such telemetering equipment is the construction of the transmitter for generating the transmitted pulses. The transmitter should be relatively accurate with respect to control of the transmitted pulses, to obtain reasonable accuracy in the positioning of an indicator or like member at the receiving station. It should not be unduly complicated in its electrical or mechanical construction, and it should be capable of use over long operating periods without an undue amount of servicing or repair. It is also desirable that the transmitter be a relatively compact assembly which can be readily installed with other industrial equipment, as for example with liquid tank gauging equipment as previously mentioned. Insofar as we are aware, no transmitter unit is available which will fulfill these requirements.

It is an object of the present invention to provide a novel transmitter for use in telemetering systems of the pulsing type, which functions automatically to generate pulses in a predetermined manner.

Another object of the invention is to provide a transmitter of the above character which will provide means for automatically transmitting an identifying code signal, in addition to transmitting position indicating pulses.

Another object of the invention is to provide a transmitter of the above character which is relatively accurate with respect to its generation of pulses, and which will therefore contribute to the over-all accuracy of a telemetering system.

Another object is to provide a transmitter which is capable of transmitting pulses which indicate position in two units, such as feet and inches.

Another object of the invention is to provide a novel transmitter which is not unduly complicated in either its electrical or mechanical features, and which is capable of use over long operating periods without undue servicing or repair.

Another object of the invention is to provide a transmitter of the above character which is completely automatic in its operation, and which carries out a complete cycle of operation after receiving a triggering pulse.

Further objects and features of the invention will appear from the following description in which the preferred embodiment has been set forth in detail in conjunction with the accompanying drawing.

Referring to the drawing:

Figure 1 is a side elevational view in section of one embodiment of our invention illustrating a transmitter unit incorporating the present invention.

Figure 2 is an end view showing the operating parts within the enclosing housing of Figure 1, and taken as indicated by the line 2-2 of Figure 1.

Figure 3 is a cross-sectional view taken along the line 3-3 of Figure 1.

Figure 4 is a cross-sectional view taken along the line 4-4 of Figure 1.

Figure 5 is a cross-sectional view taken along the line 5-5 of Figure 1.

Figure 6 is an enlarged detail in section taken along the line 6-6 of Figure 1.

Figure 7 is an enlarged detail in section taken along the line 7-7 of Figure 1.

Figure 8 is a detail in section taken along the line 8-8 of Figure 1.

Figure 9 is a cross-sectional view taken along the line 9-9 of Figure 1, and indicating only the upper half of the unit.

Figure 10 is a view like Figure 9 and taken along the line 10-10 of Figure 1.

Figure 11 is a cross-sectional detail taken along the line 11-11 of Figure 2.

Figure 12 is an enlarged detail of the embodiment in Figure 1 illustrating one of the multi-contact switches and its-operating means. a

Figure 13 is an end view of the multi-contact cam operated switch of the embodiment in Figure 1.

Figure 13A is a cross-sectional detail taken along the line 13A-13A of Figure 13.

Figure 14 is a circuit diagram serving to schematically illustrate the electrical and mechanical features of the embodiment in Figure 1.

Figures 14A to 14D, inclusive, are schematic views of the embodiment in Figure 1, showing certain cams in various operating positions at different points of a complete cycle.

Figure 15 is an end view as in Figure 2 of another embodiment of our invention.

Figure 16 is a detail in section taken along the line 16-16 of Figure 15.

Figure 17 is a circuit diagram serving to schematically illustrate mechanical and electrical features of the embodiment in Figure 15.

The transmitter illustrated in the drawings, Figures 1 to 14D inclusive, consists of a base plate 10 (Figure 1) which serves to mount the various working parts. A positioning shaft 11 extends through and is journaled to the base. It is the angular positioning of this shaft which one desires to transmit by way of control pulses to the receiving station.

Various appliances can be connected to the shaft 11 to determine its positioning. By way of example the shaft is shown schematically connected to liquid tank gauging equipment. This equipment can include a float (not shown) located within a liquid storage tank (not shown) and connected to the lower end of a perforated metal gauging tape 12 (Figure 4). Exterior of the tank, the tape passes through the casing 13, where it is tracked over the guide rollers 14 and 15 and the intermediate sprocket wheel 16. The spaced perforations of the tape register with the studs 17 provided on the wheel 16. The tape can be urged against the periphery of the wheel 16 by suitable means such as the resilient endless belts 18. The Wheel 16 is directly connected to the shaft 11, and the length of the tape extending beyond the casing 13 is attached to suitable take-up counterbalancing means, as a weight or a spring urged take-up reel.

Upon one side of the base plate 10, which is enclosed by the removable housing 21, there is another stationary mounting plate 22 which is attached to the plate by the mounting studs 23. A bushing 24 is mounted upon plate 22 and serves to journal the shaft 26. Carried loosely on this shaft are the wheels or discs 27 and 28. These discs can be formed of suitable material such as an insulating material for disc 27 and brass for disc 28.

Disc 28 has a direct l to 1 drive connection to shaft 11. Thus, it is mounted upon a bushing 29 that is journaled on the shaft 26, and which carries a gear 31. Gear 31 meshes with the gear 32 that is fixed to the shaft 11. The discs 27 and 28 are operably connected whereby for each revolution of disc 28, disc 27 is advanced a small angular increment. Thus a Geneva pinion 33 serves to operatively connect the two discs, and

plate 38. One portion 33a of the 1) may be formed as an ordinary spur gear pinion, and the teeth of this portion engage the teeth 39 formed on the periphery of disc 27 (Figures 1, 8 and 9) and the teeth 41a of the Geneva transfer block 42a (Figures 6 and 10) carried near the periphery of disc 28. Another portion 33b of the Geneva pinion can be formed with relatively few teeth (Figures 7 and 10) that are adapted to operate within a notch 41b formed in the periphery of the disc 28 and in the block 42b.

The form of pinion portion 33b is such that when the notch 41b is not in operating position and the teeth 41a are not engaged with the Geneva pinion, the Geneva pinion 33 is locked in a fixed position by action of the teeth of pinion portion 33b coming in contact with the periphery of disc 28 as shown in Figure 7.

The discs 27 and 28 serve to mount certain electrical contacts which can be referred to as sweep contacts. Thus, one contact 43 is carried by the spring arm 44, which in turn is mounted on the disc 27. It is electrically connected to the brush contact 46 that engages the slip ring 47. The slip ring has an insulated mounting on the sleeve 24, and is electrically connected to the circuit illustrated in Figure 14, as will presently be explained.

For the disc 28 there is a contact 48 carried by the insulated spring arm 49. A metal slip ring 51 is carried by the disc 28, and is electrically connected to the contact arm 49 by the stud 52. Suitable insulating means serves to mount the slip ring 51 on disc 28 to prevent its grounding to the shaft or to other adjacent metal parts. The slip ring 51 is engaged by the stationary brush contact 53 that has an insulated stationary mounting 54, and which likewise is connected in the electrical circuit.

Cooperating with both of the contacts 43 and 48, there is a sweep contact arm 56. This arm is directly mounted by collar 57 upon the metal shaft 26, and is therefore grounded to the metal parts of the apparatus. Assuming rotation of shaft 26, arm 56 swings through an are such that it is brought into electrical engagement with contacts 43 and 48, at positions depending upon the angular positioning of the discs 27 and 28.

Pulse generating contacts 61 and 62 are provided in conjunction with the cam 63 (Figure 2) for generating the pulses to be transmitted. These contacts are carried by the spring arms 64 and 66, which are supported by the insulated mounting 67. The normal spacing between the contacts can be adjusted by the set screw 68. The shaping of cam 63 is such that a substantial period of dwell is provided after the contacts 61 and 62 are closed. Also the valleys provide a substantial space period between periods of closure, thus providing the desired time spacing between pulses.

Suitable means is provided for driving the cam 63, such as an electric alternating current motor 69 of the self-starting synchronous or shaded pole type (Figures 3 and 11). The pulsing cam 63 is mounted on the hub (Figure 11) together with gear 70 and pinion 71 and the hub is journaled to the stud 72. Speed reducing gearing connects the cam 63 to the motor shaft, including the pinion 73 which is attached to the motor shaft, gear 74 which meshes with pinion 73, and pinion 75 which is fixed to the gear 74 and which meshes with the gear 70. The speed with which the cam 63 is driven is such as to provide the desired rate of pulse transmission. With the equipment which we have constructed, a pulse rate of the order of 8 pulses per second has been found satisfactory. Each pulse was A of a second duration, thus providing a spacing between pulses of A of a second. This rate can be varied over a wide range, the limiting factors arising in associated equipment.

The same motor 69 is employed to turn the shaft 26 and the sweep arm 56. The gear train for this purpose includes a gear 78 which is driven by pinion 71 (Figures 2 and 11), a pinion 79 which is directly connected to gear 78, and a gear 81 (Figures 1 and 2) which is mounted upon a hub 82 and connected to drive 'the shaft 26. Suitable means can be imposed in this gear train to apply a predetermined amount of friction braking such as a light compression spring 83 interposed between one end of pinion 79 and the lock nuts 84 on the stud 86 upon which this pinion is journaled.

A cycling cam 87 (Figure 2) is also mounted to rotate together with shaft 26. Thus, this cam is shown carried by the shaft adjacent the one side of the gear 81, and coupled to the gear by means of screws 88 which are mounted upon the gear and which extend into openings 89 provided-in the cam.

The peripheral surface of the cam 87 is circular except for the notches 91, 92 and 93 (Figure 2). The cam serves to operate a multi-contact switch designated generally as S Switch 8; consists of the spring arms 96, 97, and 98 (Figure 12) which are carried by the insulating mounting 101a and spring arm 99 mounted on the metal block 101 and grounded by it. The free end of spring arm 96 carries a foot or pad 102 (Figures 13 and 13A) for engaging the periphery of the cam 87. The free end of the spring arm 99 likewise carries a foot or pad 103, for engaging the cam surface. Foot 103 extends slightly beyond foot 102 so that as the two ride over the shoulder of a notch in the cam 87, 102 drops first and then is followed by 103. The stressing of spring arms 96 and 99 is such that 102 and 103 are urged against the peripheral surface of cam 87. Stressing of spring arms 97 and 98 is such that when foot 102 drops, contacts 0 and p are open until foot 103 drops. Spring arm 96 also carries an insulating pad 104, serving to elevate spring arm 97 when the arm 96 is raised. Cooperating electrical contacts 106 and 107 are carried by spring arms 97 and 98, and cooperating contacts 108 and 109 by the spring arms 98 and 99.

Insulated mounting 101b carries a switch designated generally as S5 and which includes the spring arms 112, 113, 114, and and spring arm 111 which is grounded on metal block 101. These spring arms are provided with contacts 116, 117, 118, 119, 120, and 121. The contacts 117 and 119 are mounted upon the same spring arm 113. Spring am 113 also carries an insulating pad 122 serving to elevate spring arm 114 when arm 113 is raised.

The contacts of switch S are operated by the pin 123, carried by the latch 124. One end of this latch is pro vided with a slot 126 to loosely accommodate the mounting pin 127. The latch is operated by a rotating cam 128, which is mounted upon the stud 129 together with its operating gear 131 (Figure 1). Gear 131 meshes with the pinion 132 which is fixed to rotate with the shaft 26. The gear ratio is such that the cam 128 makes one complete revolution for two complete revolutions of the cam 87.

The cam 128 rotates in a counter-clockwise direction as viewed in Figure 2, while the cam 87 revolves in opposite direction (i. e. clockwise as viewed in Figure 2). The periphery of cam 128 is provided with the notch 133, adapted to accommodate the cam lug 134 on the latch 124. The lug 134 is such that it drops down over the cam shoulder 136, as the cam 128 rotates, and the lug has an inclined camming face 137 adapted to be engaged by the camming face 138 on the rotary cam 128 to force the latch 124 upwardly, and with a force component to the left as viewed in Figure 2. The latch is yieldably urged downwardly and toward the right as viewed in Figure 2, by the tension spring 139. The arrangement of the cam 128 with respect to the latch 124 is such that as the cam revolves (counter-clockwise as in Figure 2) the latch is cammed upwardly, whereby the pin 123 operates the switch 8 It may be explained that such operation takes place before the foot operation is commenced. Thereafter the latch remains in a raised position until the end of a complete cycle of operation, at which time the cam 128 has made substantially one complete revolution and has rotated to a position where the latch can drop down to substantially the position illustrated in Figure 2.

Means is provided whereby the latch, in its raised posi-.

tion, locks the Geneva transfer pinion. Thus a gear 141 (Figures 1 and 12) meshes with one end of the Geneva pinion 33, and is journaled on the stud 142. A toothed ratchet-like wheel 143 is fixed to the gear 141, and is adapted to be engaged by the pawl 144, formed on the upper edge of the latch 124 (Figures 2 and 12). The arrangement is such that when the latch is raised, the pawl 144 engages with one of the teeth of the ratchet wheel 143, thus locking this wheel and the Geneva pinion against further rotation. The lost motion of the latch 124 with respect to its mounting stud 127 insures locking engagement with the toothed wheel 143 when the pinion 33 is in a position that it might occupy while transferring motion to the wheel 27. The locking of pinion 33 locks the foot wheel 27 but allows the inch wheel 28 to follow the fluid level within the limits of one foot.

It may be desirable to have means actuated by latch 124 to frictionally engage both the foot and the inch wheels so as to lock them before the reading operation.

The operation of latch 124 prevents errors in reading greater than one increment of the inch wheel which in the embodiments of our invention would be one-eighth of an inch. This is accomplished by the following operation: If latch 124 finds pinion 33 in the position Where it is transferring an additional increment to the foot wheel, it will when cammed upward, and forward, if necessary, move toothed wheel 143 to one position or the other depending on which is nearer. One direction would carry the foot disc 27 to the next increment and place the inch disc 28 at its minimum or zero. The other position would return the foot wheel to the previous increment and the inch disc to its maximum or 11% inches. This prevents incorrect readings and assures that the transmission of the foot pulses will be terminated at the end of a full pulse, and prevents the transmission of a partial pulse which would occur if the foot wheel were changing from one increment to another.

The engagement of latch 124 with toothed wheel 143 also serves to fix the relationship between the foot and the inch wheels so that fluid fluctuations that might occur during a reading will not give rise to incorrect readings (e. g. at the time the reading was instigated the fluid level could be 6 feet 11 /8 inches, then the transmitter would trans- 6 mit the pulses indicating 6 feet and before the inches could be transmitted, the level could then rise to 7 feet 0 inches, whereby pulses indicating 0 inches would be transmitted causing an error of nearly a foot in the reading). Errors which could occur by the liquid falling during the reading operation are also prevented in the same manner.

In additionto the switches previously mentioned, the mounting 101a supports a spring arm 146 carrying contact 147 which is electrically connected to spring arm 98 (Figures 2 and 12). This contact is adapted to engage the face of the metal cam 128, and is thus grounded upon the same. At one point the face of the cam 128 carries a small area or spot 148 formed of insulating material, which at a certain point in the rotation of the cam 128 engages the contact 147 to interrupt grounding of the spring arm 146. This point corresponds to substantially one/half revolution of the cam 128 from its starting position.

Acting in conjunction with cam 87 is an additional switch arm 151 which is adjustably secured by attaching means 152 to the metal strip 153. Attaching means 152 also serves to ground switch arm 151 to shaft 26. The contact 154, carried by the free end of the spring arm 151, is adapted to engage the contact 155, which is located on one side of the spring arm 96 (Figure 13). The angular setting of the spring arm 151 with respect to the cam 87 determines the number of coding pulses which are transmitted prior to transmission of the indicating pulses. In addition to the electrical parts previously described,

the plate 22 forms a convenient mounting for a plurality of multi-contact relays R R R and R which are utilized in the electrical circuit.

In Figure 14 certain of the mechanical parts have been illustrated schematically to facilitate explanation. Instead of applying separate numerals to the various contacts of the relays R R R and R the cooperating sets of contacts have been designated by lower case letters a to n, inclusive (except 1'). The various sets of contacts on the switches S and S have likewise seen designnated by' lower case letters 0 to t; inclusive. The switch comprising spring arm 146 and the cooperating cam 128 is designated as S and the cooperating contacts by lower case letter u. The contact 43 carried by the foot wheel, together with the sweep arm 56, has been designated as switch S and its cooperating contacts by the lower case letter v. The contact 48 carried by the inch wheel 28, in conjunction with the sweep arm 56, has been designated as switch S and the effective cooperating contacts by lower case letter w. The pulsing contacts have been designated as switch S and its cooperating contacts by lower case letter x.

Telegraph lines T and T (Figure 14) extend to the receiving station. As is understood by those familiar with telegraphic circuits, one of these lines can be omitted by using a ground return. Lines L and L represent a local source of alternating current supply, such as the standard volt A. C. The power supply is connected to both the primary of the transformer 157 and to the motor 69 which are in series with contacts a of relay R said contacts a being in parallel with contacts d of R; and contacts r of S One side of the transformer secondary is grounded (i. e. connected to the metal frame of the transmitter unit) and the other side connects to one terminal of the coil for relay R and also to the corresponding terminals of relays R and R In general relay R can be termed a triggering relay. Its purpose is to close the circuit for supplying 110 volts to the transformer 157 and motor 69, and to condition the relays R R and R for operation. The purpose of relay R is to sustain the supply of 110 volt alternating current to the motor and transformer after the relay R has been released (i. e. deenergized) and to prevent false signals during certain portions of the operating cycle. The purpose of relay R is to selectively condition the circuit for the transmission of either code pulses and 7 feetpulses, or.- inch pulses. Relay R is agati'ngi relay whichservesto establish and terminatethepgllses.

Operation. of. our. apparatus can. now bedescribeias follows: It is assumed that the hnes T and .T are connected to a remote receiving station which includes a battery or othersuitable. supply indicating means operated step by step in response to the receipt of.1ulses, .and means for transmitting,a,starting,pulse tqihesendings ae tion. The means at the, receiving station canthe-lsuhr stantially as. disclosed and claimed, in. copending appl cationSerialjNo. 307,444, filedSeptember A1952,

It may be found desirabletmpmvide. aJself. con aine source of" signalling voltage. Within. the sending;statininstead'of the receiving station.

Figures 14Ato 14D. inclusive/ schematically illustrat the positioningof certain operatingpartshf the apparatus at different points in a complete operating cycle. Rat.- ticularly they show the relative positioningof the cams 87 and 128, together with.the.latch,124..and thetoothed wheel 143. In Figure 14A the parts-are illustrated. in.the positions which they occupy at the.begi nning,0f.an.auto.- matic cycle. At that time motor. 69. and. transformer. 157 are de-energized, and all of the,relays R R R and; R are de-energized or released.v Before outlininglhe. positions illustrated in Figuresv 14B; 14C..and'1.4D, it may: be explained that a complete operatingyycle.servesfirst; to transmit pulses to the receivingstationover. thelines T; and T These pulses serve. as in identification and therefore can be referred to as codingpulses... The pulses. 3-0;

are effectively transmitted by placing an intermittentdig. rect short circuit between lines T ,and.T by,closing:and.. opening the pulsing contacts x. The. number. ofpulse's transmitted for identification is determined. bytheangular setting of the arm 151 relative to the cam 87. In atypical system one can provide for or more pulses. for such coding purposes.

' Aftercoding pulses have been transmitted there. is,a, short pause, after which pulses are transmitted to indicate the position of the foot wheel 27. The number of pulses is determined by the angle through which the contact arm 56 sweeps from a base position before it engages the contact 43 carried by foot wheel 27; Following transmission of the foot pulses, the cam 87 completes the first revolution, and then during its second revolution pulses are transmitted in accordance with the angle through which the arm 56 sweeps before it engages the contact 48, carried by the inch wheel 28. After. transmitting the so-called inch pulses, the cam 87 returns to its initial position, after which the apparatus is returned to rest in the same condition as it was before it was.

started.

As previously stated the apparatus is started in operation by a starting or triggering pulse transmitted over the lines T a'ndT from the receiving station, and this starting pulse provides sufficient voltage to energize the coil or relay R it will be noted that this winding is connected across the lines T and T in series with the contactse of relay R When relay R is energized, its contacts a, b and c are closed. Because contacts a are connected in series with the power supply L andL and the motor 69 and transformer 157, the closing of contacts a supplies current to both the motor and the transformer, whereby the motor is started in operation to drive the pulsing cam 63, cams 87 and 128, and the sweep contact arm 56.

Closing of contacts b of relay R together with energizing thetransformer 15.7 supplies current to the coil of relay R whereby this relay is operated. The circuit is completed from the transformer through the coil of relay R4, and through the contacts 12 of relay R to ground. Upon operation of this relay its contacts m and n are closed, while contacts I are opened; Closing of contacts n-completes a holding circuit to continue holding current through-the coilof relay R orin other words to latch this relay in operated. i.. e. energized position. The.

holdingcircuit. is completditorn the transformer thrnugh the. coil, of relay'R;, through. contacts. 11, and. through thecontacts. o andp-ofj switch sgtoground. Closingof Simultaneously with fthe. operation, of'relay R relay R isenergized. The energizing circuit for the relay coil' ofrelay is completed from. the transformer through the relay coil of relay R' .th.ro.ugh the contacts s of switch Sg throu'gh contacts c, oflrelay R through the contacts In ofrelay Rgio g'round';

A holding circuipfor relayK 'is then completed from the transformer through the coil of'relay R througlLthe contacts k of relay R .thro ug l '1 thecontacts 0 ofswitch S togroundl' Aholding circuit for relayR is completed from the transformer throughtherelay coil of R through contacts s offswitch' S'ithrough contacts k. of relay R through contactso of'swit'ch 8 to ground;

When: relay -R* is. operated the opening of its .contacts ihterrup tsthe. coil. circuit for. relay R whereby relay 2'5 Ri islir eleasedfj Upon its release all of its contacts a, b and fm ases-1 "-Although"the motor-691s dtiving the pulsing cam 63 as soonas itisenergized no pulses are transmitted over the lin"iipito thisjtimeihecause thecontacts l of'relay' R are K edas'fsoon as relay'Rg -isenergized'which occurs immediateiy are; the motorhasbeen energizedand'before Qf rciay R afeclosed:

When bfeen rotated asuflicienLamount' by'mot'orf69 to cause theswitch font1102 on spring' arm- 35' 96 to-drop'into'thq'notch 92f(ii e: operation of'switch St) the partsare subs'tantiaily in the position illustrated in Figure-14B: The cam-12.8% nowcamming the latch upwardly-to -'a; position just short of locking positiorrwith the-toothed wheel 143.- When switch foot 102'. drops downintonotch' 92, contacts 0' and p of switchSi are. opened momentarilyuntil foot 103 on spring arm 99' drops down upon further rotation of cam 87. The momentary opening of contacts p interrupts the holding circuit of relay R; by removing contact 106 (the lower contactof contacts p)- on spring-arm 97 from ground. The momentaryopening of contacts 0 does not affect the holding circuit of 'rel'ay R because a ground is maintained by S (contact 147 on spring 146 maintaining contact with grounded cam 128-) Contacts .0 and p are-closed by the further rotation of cam 87 as pointed'outabove, however, this does not reenergize relay- R because contacts n are now open.

Afr-this time relay R is conditioned to be operated bygroundingof cont-acts q (grounding occurs by contact 154; on arm 151 coming in contact with contact 155 mounted on'foot 102 of spring arm 96) or contacts v (grounding occurs by contact 43 on foot disc 27 coming in contact with sweep arm 56). A circuit is completed from.the transformer through the coil of relay R through contacts .h.ofirelay'R' through-contacts q or v to ground.

Theabove.mentioned' momentary operation of switch S (-i; e; dropping of feet 102 and 103) occurs during an open periodofithe contacts x whereby relay R will be releasedduring that 'interval so-that only complete pulses will be transmitted; This same timing relationship also takes place before the .sending 0f;the foot pulses and also the inch pulsesdescribed subsequently.

As described above, the dropping of feet 102 and 103 into notch 92 of cam 87 releases relay R and initiates transmission ofcoding pulses being generated by. contacts x due torotation-of cam 63. The-circuit for transmission of.the pulses is from line T through contacts 1 oft relay R ,,through contacts [of relay R through contacts; x of switch S to. linev T The apparatus continues to transmit coding pulses until 9 contacts q are closed. As previously stated, this is dependent upon the position of the arm 151 relative to the earn 87. In a typical instance five pulses can hen-ansrnitted to disclose the identity of the transmitting station to the receiver. Such identification is desirable where a number of transmitters may be selectively connected to a single receiving station. As previously mentioned, when contacts q are closed, current is supplied to the coil of relay R whereby this relay is operated to break its contacts 'l. The opening of these contacts interrupts further transmission of pulses. Relay R is again latched in operated position by closing of holding contacts n of relay During the period allotted for transmission of code pulses, the latch 124 is being cammed upwardly to lock the ratchet wheel 143, and to efiect operation of switch S This camming action is shown in Figures 14A, 14B and 140. In the operation of this switch contacts 1 and 'r are closed, and contacts s are opened. Closing of contacts r insures resumption of current to the transformer from the 110 volt power supply, because these contacts are in parallel with the contacts d of relay R This is desirable because of the probability that relay R may be released by momentary power failure. This prevents the Geneva pinion 33 from remaining locked after resumption of power. Also if power has been interrupted during the reading operation, the contacts r return the device to its starting position because they sustain a power circuit to the motor independent of relay R The closing of contacts t of switch S is accompanied by opening of contacts s and the opening of these contabts serves to interrupt the holding circuit for relay R through contacts k of relay R and is thus only sustained by con tacts -'z of switch S The action is such that contacts I close before contacts s open.

After a suitable interval after the coding pulses have been terminated by closing of contacts q, switch S oper- "ates again by dropping into notch 93 and releases relay R; as before whereby the pulsing contacts x are connected to lines T and T to secure a foot indication. Actually the number of such pulses transmitted indicates the angular position of wheel 28 from a base starting point. The pulses are transmitted until the sweep arm 56 engages the contact 43. On the circuit diagram 'of Figure 14 this corresponds to closing of the contacts v, which again completes the energizing circuit through the coilof relay R through contacts 11 whereby the holding circuit through contacts n is again energized and contacts I opened to discontinue further transmission of pulses.

In the preferred form, the gearing between cam 63 and sweep arm 56 is such that one closure of contacts x '(i. e. 4

transmission of one pulse) occurs for each increment of displacement represented on each of the foot and {inch wheels. It may be desirable to transmit fewer or more pulses for each increment measured in certain applications.

The apparatus now continues to operate, with'continued rotation of the cam 87, until it has completed nearlyone revolution from its starting point. Now switch S is again operated by the notch 91, whereby the opening of 'con tactsp again releases relay R However, this time -the opening of contacts 0 by operation of switch S also interrupts the holding circuit for relay R because aground is no longer sustained by switch S because it is now in contact with insulating spot 148.

Continued rotation of cam 87 closes contacts 0 and p but switch S will no longer have any electrical etieot-on the apparatus for the remainder of the reading operation because contacts'p are now grounded through contacts 1' of relay R and contacts 0 are again grounded through switchS as it has moved'from the insulating spot 148.

Since relay R is now in a released condition, the apparatus now proceeds to transmit pulses indicating the position of the inch wheel 28. This transmitting condition continues until the sweep arm 56 moves from an initial base position to a position where it engages contact 48 on the inch wheel 28 and thereby energizes relay R; by completing a ground through contacts g of relay R3 to contacts w on the inch wheel 28, which in turn interrupts the transmission of pulses by opening of contacts l on relay R The holding circuit for relay R is again energized by the contacts 11..

Toward the end of the second complete revolution of cam 87, cam 128 is completing its first revolution. The return of cam 128 to substantially its initial starting point causes the latch 12 4 to snap down over the shoulder 136, to release the ratchet wheel 143 and the Geneva transfer pinion, and to effect an operation of switch Sg. This occurs after the time that the switch S engages the notch 91 on the second revolution of cam 87. The time interval between the transmission of the inches and the shut down of the equipment is to allow the receiver (not shown) to sense that the transmitting operation has been completed. Operation of switch S causes the contacts t to be opened, which serves to interrupt the holding circuit for the relay R The power supply for the motor 69 and the transformer 157 is interrupted by the breaking of contacts 11 of relay Rh caused by the de-energization of relay R and by breaking of contacts r of switch S caused by the dropping of pawl 124.

As pointed out previ'ously, the purpose of relay R is to prevent false signalling during certain portions of the reading operation, namely the period following the complete cycle after the power circuit to the apparatus has been broken; but while the cam 63 is still in motion due to the momentum of the various driven parts. This false signalling is prevented by the opening of contact 1 of relay R After de=energi2ation of both the motor and the transformer, the apparatus coasts to a stop substantially in the position illustrated in Figure 14A. The apparatus is then in a position to be energized for another reading operation;

Another embodiment of our invention is shown in Figures 15 to 17 inclusive. It is the purpose of this embodiment to transmit pulses-indicating coarse and fine units simultaneously by the use of three wires, one of which can be a ground return, whereas, in the embodiment shown in Figures 1 to 14D inclusive, it is only possible to transmit pulses indicating coarse and fine units sequentially.

The embodiment of our invention for transmitting pulses simultaneously is substantially the same as illustrated in Figures 1 to 14D except for the changes shown in Figures 15 to 17 inclusive. The major changes are that cam 87a has been interchanged for cam 87, cam 128a for 128, insulating spot 148i: for 148, insulating pin 12312 for pin 123,- switch S' for switch S and switch S for switch S It will be noted that earn 87a serves to operate a switch designated generally as S7 which consists of spring arms 171 and 172 'which are carried by the insulated mounting strip 101a. Spring arm 171 carries electrical contact 173 and spring arm 172 carries electrical contact 174. Spring arm 171 also carries member 175 for engaging the cam 87a.

Insulated mounting strip 101!) carries a switch designated as S which consists of spring arms 176, 177, 178 and 179 which are provided respectively with contacts 180, 181, 182 and 183. spring -arr'ns 177 and 179 are also provided with a pad 184 which serves to raise the spring arm 179 when spring arm 177 is raised. All of the contacts of switch S; are operated by the insulating pin 123a carried by the latch 124.

As in the previous embodiment, the cam 128a makes one complete revolution for two complete revolutions of cam 87a. The. cam 128a rotates in 'a counter-clockwise direction as viewed in Figure 15, while cam 87a revolves in a clockwise direction.

By way of example, in one typical instance cam 87:;

11' a was made to rotate at a speed of revolutions per minute and cam 1128a to rotate at 2 /1 revolutions perminute. Using such aspeed, and by placing cam 87a in a starting position as shown in Figure 15 (120 from the position where it will operate switch S it is possible to receive a trigger pulse up to 3 seconds in .duration. Insulating spot 148a on cam 128a was placed in such a position that it would be electrically in contact with switch S at the second operation of switch 8-, by cam 87a. To accomplish this insulating spot 148a was placed 240 from the position where it would come into contact with switch S With this timing relationship, latch 124 will rise in approximately 2 seconds to operate switch S after receipt of the triggering pulse and switch S; will operate within 4 seconds after receipt of the pulse.

In the embodiment of our invention shown in Figure 15, multi-contact relays R R R and R are mounted on plate 22 and have been substituted for relays R R R and R Figure 17 is a circuit diagram of this embodiment with a schematic illustration of certain mechanical parts to facilitate explanation. The cooperating sets of contacts on relays R R R and R have been designated by the lower case letters aa to hit. The various sets of contacts on the switches S and S have likewise been designated by the lower case letters ii to kk. The switch comprising spring arm 146 and cooperating cam 128a is designated .as switch S and the cooperating contacts by lower case letter a as in the previous embodiment. The remainder of the contacts remain unchanged from the previous embodiment.

Telegraph lines T T; and T (Figure 17) extend to the receiving station. As is understood by those familiar with telegraphic circuits, the common return line T can be omitted by using a ground return. Lines L and L represent a local source of alternating current supply such as the standard 110 volts A. C. The power supply is connected to both the primary of transformer 157 and to the motor 69, both of which are in series with contacts aa of relay R Contacts aa are also in parallel with contacts kk of switch S One lead of the transformer secondary is connected to contact dd of relay R and also to spring arm 171 of switch S The other lead of the transformer secondary is connected to one terminal of the coil of relay R and also to the corresponding terminals of the coils of relays R and R In general relay R can be termed a triggering relay and its purpose is to close the circuit for supplying power to the transformer 157 and the motor 69 during receipt of the triggering pulse. Relay R may be termed a signal starting relay as it serves to initiate transmission of foot and inch pulses over lines T T and T and also to sustain a ground through contacts dd and thereby conditioning relays R and R for operation. Relay R may be termed the foot relay as its operation terminates the sending of foot pulses, and relay R may be termed the inch relay as its operation terminates the sending of the inch pulses.

Operation of the embodiment shown in Figure 17 may now be described as follows: It is assumed that lines T T and T 5 are connected to a remote receiving station which includes a battery, indicating means operated step by step in response to the receipt of pulses, and means for transmitting a starting pulse to the sending station.

The operation is commenced by sending a starting pulse to the sending station over lines T and T to energize the coil of relay R whereby relay R is operated. This circuit is completed from line T; to normally closed contacts ii of switch 8,; through the coil of relay R and then to line T The operation of relay R closes contacts aa which energize the motor 69 and the transformer 157. This circuit is completed from line L; to contacts aa of relay R and thence in parallel through the motor and the transformer to the line L sweep arm 56 into operation.

Starting of the motor 69 starts cams 63, 87a, 128a and After a suitable interval cam 128a starts camrning latch 124 upward as shown in Figure 14B whereby switch S is operated. As switch S is being operated, contacts kk are first closed, and since these contacts are in parallel with contacts aa of relay R they will serve to sustain the power to the transformer and the motor after relay R has been released and contacts aa opened. Further operation of switch S serves to open contacts jj which serves to break the energizing circuit for relay R As described in the previous embodiment, further camming upward of latch 124 serves to lock the Geneva pinion 33 during the remainder of the reading operation.

After a suitable interval subsequent to the operation of switch S and the locking of Geneva pinion 33, cam 87a comes in contact with member on spring arm 171 thereby engaging switch S and closing contacts ii momentarily. This momentary closing of contacts ii grounds one of the secondary leads of transformer 157. This circuit is completed from one transformer secondary lead to contacts ii of switch S, to switch 8;, which is grounded on cam 128a except when it is in contact with insulating spot 148a which it is not at this time. Since one side of the coil for relay R is grounded and the other side of the coil is connected to the ungrounded transformer secondary lead through contacts ii, the coil of relay R is energized whereby relay R is operated which in turn closes the contacts bb, cc, and dd. Closing of contacts dd energizes a holding circuit for relay R thereby securing the continued operation of relay R even after contacts ii on switch S are opened. This holding circuit is completed because contacts dd of relay R continue to sustain the ground initiated by contacts ii of switch S This sustained grounding of one lead of the transformer secondary serves to place relays R and R in a position to be operated by grounding one side of their coils as the other side is connected to the ungrounded secondary lead of transformer 157.

It must be borne in mind that as soon as the motor 69 is energized by the closing of relay R the cam 63 starts operating switch S so that contacts x are continuously opened and closed. However, no pulses are transmitted over the lines T T and T until relay R is operated because contacts bb and cc of relay R are normally open. However, as soon as relay R is closed, foot and inch pulses are transmitted over the lines T T and T simultaneously.

The circuit for sending the foot indication is from line T through contacts bb of relay R through normally closed contacts as of relay R through pulsing contacts x of switch S to line T The circuit for sending the inch indication is from line T to contacts cc of relay R to normally closed contacts gg of relay R through pulsing contacts x of switch S to line T Cam 87a has been so positioned that it will operate switch S to close contacts ii at such a time that the contacts x of switch S are open so that transmission of foot and inch pulses will start at the beginning of a pulse rather than at any other part of a pulse. Sweep arm 56 is so positioned in relation to cam 87a that it is at the reference or zero point of the foot wheel 27 and the inch wheel 28 at the time cam 87a operates switch S to close contacts ii to operate the relay R Therefore, the foot and inch pulses are commenced at the time the sweep arm 56 is at the reference or zero position.

The transmission of the foot and inch pulses over lines T T and T continues until each series is respectively terminated. The foot pulses are terminated by the sweep arm 56 coming in contact with contact 1 on the foot wheel 27 whereby one end of the relay coil of relay R is grounded thus completing a circuit through the coil of relay R and operating relay R This circuit for energizing relay R is completed because one secondary lead of transformer 157 is grounded through contacts dd of 13 relay R and the other secondary lead is grounded through the coil of relay R through contacts v to grounded sweep arm 56.

This operation of relay R serves to open the normally closed contacts ee and thereby opens the circuit between the pulsing contacts x and the line T Contacts ff of the relay R are closed to maintain a holding circuit for relay R; by sustaining the ground initiated by contacts v.

The inch pulses are terminated in a similar manner when the sweep arm 56 comes in contact with contact w which grounds the coil of relay R5 and serves to operate relay R thereby opening the normally closed contacts gg which open the circuit between the pulsing contacts x and the line T Closing of contacts hh completes a holding circuit for relay R by also sustaining a ground.

After the completion of the transmission of the foot and inch pulses, the cam 87a again operates switch S closing contacts ii, but this time the contacts ii have no effect on the circuit as the switch S is in contact with the insulating spot 148a on cam 128a and also because a ground is normally still sustained through contacts dd= of relay R This insulating spot 148a is necessary because a momentary power failure could release all of the relays during the first revolution of cam 87a and then the subsequent operation of contacts ii would operate relay R to start a false reading operation if switch S were not released from ground by insulating spot 148a.

The respective cams continue to rotate until cam 128a has rotated to such a position that the latch 124 drops into notch 133. This returns switch S to its normal position and opens contacts kk which interrupt the source of power to the motor 69 and the transformer 157. This operation of switch S also serves to place the contacts ii in their normally closed position which returns 'the coil of relay R to the lines T and T The equipment is now in position for reception of a triggering pulse to commence a future reading operation.

It will be evident from the foregoing that our apparatus has many desirable features which adapt it for use in a wide variety of telemetering systems. Its application to remote liquid level tank gauging is only one of many industrial applications. It can be used for example to secure remote readings of temperatures, pressures, fiow rates and like data, or the motion which is provides at a remote point can be used to facilitate automatic or semiautomatic control of industrial equipment or processing operations. The apparatus can be made more elaborate or can be simplified, in accordance with the requirements in each particular instance. For example, in the first embodiment described in some instances it may not be necessary or desirable to utilize code pulses transmitted before the indicating pulses. The transmission of code pulses can be omitted by eliminating notch 92 in cam 87 or by the simple expedient of adjusting the contact arm 151 whereby it immediately engages contact 155, before the code pulses are transmitted. For remote liquid level gauging it is desirable to transmit two separate series of pulses, one representing feet and the other inches by eighths. It will be evident however that these units are taken merely because of their standard use in tank level gauging, and that by simple changes the two series of pulses can be used to indicate various units of measure, such as meters and centimeters, degrees and minutes of angular displacement, and the like. In some applications where accuracy is not essential, a single train of pulses may be sufficient. Here again the apparatus can be adjusted to transmit a single train of pulses, instead of twotrains, or if desired the apparatus can be simplified by eliminating the means incorporated for transmitting the second train.

We claim:

1. In telemetering transmitting apparatus of the typeadapted to indicate the extent of displacement of an element from a base position by a plurality of pulses transmitted to a remote receiving station, said apparatus comprising means including pulsing contacts for transmitting electrical pulses to the receiving station, a motor for driving the pulsing contacts, circuit means for energizing the motor, a first rotatable member adapted to be rotated in proportion to the displacement of said element, a second rotatable member cooperating with the said first memher, a transfer gear connecting said members whereby each cycle of rotation'of the first member serves to move the second member a fractional part of one revolution, a third rotatable member cooperating with the first and second members, means forming a motion transmitting connection between the third member and said motor whereby said third member is rotated in synchronism with operation of the pulsing contacts, said third member in one revolution moving from a starting position through an angular distance to a base starting position, and then back to the starting position, contacts carried by the first and second members whereby the angular distances through which said contacts are displaced from said base position serve to indicate the displacement of said element from the base position in terms of coarse and fine units, an electrical contact carried by said third member and adapted to engage both of the contacts carried by first and second members during rotation of the third member, means for effecting control of said energizing circuit for .the motor whereby the'motor is cycled to drive said third member two complete revolutions from its initial starting point, selector means for effecting transmission of one series of pulses for the first revolution of said third member and a second series of pulses during the second revolution of said member, means controlled by the engagement of said contact means carried by the third member for terminating each series of pulses, whereby the first series of pulses indicates the position of the second member and the second series of pulses indicates the position of the first member, means for initiating transmission of a series of pulses while said third member is moving 'from its starting position to its base position to thereby effect identification of the transmitting station, and means for terminating said last named series of pulses prior to initiating transmission of a series of indicating pulses.

2. In telemetering transmitting apparatus of the type adapted to indicate the extent of displacement of an element from a base position by a plurality of pulses transmitted to a remote receiving station, said apparatus comprising means including pulsing contacts for transmitting electrical pulses to the receiving station, a motor for driving the pulsing contacts, circuit means for energizing the motor, a first rotatable member adapted to be rotated in proportion to the displacement of said element, a second rotatable member cooperating with the said first member, a transfer gear connecting said members whereby each cycle of rotation of the first member serves to move the second member a fractional part of one revolution, a third rotatable member cooperating with the first and second members, means forming a motion transmitting connection between the third member and said motor whereby said third member is rotated in synchronism with operation of the pulsing contacts, said third member in one revolution moving from a starting position through an angular distance to a base starting position, and then back to the starting position, contacts carried by the first and second members whereby the angular distances through which said contacts are displaced from said base position serve to indicate the displacement of said element from the base position in terms of coarse and fine units, ,an electrical contact carried by said third member and adapted to engage both of the contacts carried by the first and second members during rotation of the third member, means for effecting control of said energizing circuit for the motor whereby the motor is cycled to drive said third member two complete revolutions from its initial 15 starting point, means 101' effecting simultaneous transmission of two series of pulses during the first revolution of said third member, means controlled by the engagement of said contact means carried by the third member for terminating each series of pulses, whereby one series of pulses indicates the position of the second member and the other series of pulses indicates the position of the first member.

3. Telemetering apparatus as in claim 1 together with means for locking the transfer gear against rotation before transmission of the series of pulses serving to indicate the positions of the second and first members, said locking means including a cam driven by said motor.

4. Telemetering apparatus as in claim 2 together with means for locking the transfer gear against rotation before transmission of the series of pulses serving to indicate the positions of the second and first members, said locking means including a cam driven by said motor.

5. In telemetering apparatus of the type adapted to indicate the extent of displacement of an element from a base position by the pulses transmitted to a remote receiving station, said apparatus comprising means including pulsing contacts for transmitting electrical pulses to the receiving station through a communicating medium, a first member adapted to be rotated by an amount in proportion to displacement of said element, a second rotatable member, means forming a drive connection between said members whereby rotation of said first member through one complete revolution serves to advance the second member a fractional part of one revolution, the angular displacement of points on each member from a base reference position serving to indicate the displacement of said element in terms of coarse and fine units, a third member cooperating with the first and second members, motive means for driving the pulsing contacts and for rotating said third member to efiect cyclic angular displacement of the same from a starting position through angles corresponding to the displacements of the first and second members from their base positions, said pulsing contacts being driven during the time said third member is being driven, means for connecting said pulsing contacts to the communicating medium between the transmitting and receiving station upon movement of said first and second members from their base positions, and means for disconnecting said pulsing contacts from said communicating medium when the third member passes through angles corresponding to the positions of the first and second members for terminating transmission of said pulses.

6. Telemetering apparatus as in claim 5 wherein one pulse is transmitted for each increment of displacement of said element and wherein said pulsing contacts are connected to said communicating medium at the beginning of a pulse.

7. Telemetering apparatus as in claim 5 together with means for causing simultaneous transmission of each series of pulses.

8. In telemetering transmitting apparatus of the type adapted to indicate the extent of displacement of an element from a base position by the use of pulses transmitted to a remote receiving station, said apparatus comprising pulsing contacts for transmitting electrical pulses through a communicating medium to a receiving station, a motor for driving the pulsing contacts, circuit means for energizing the motor, a first rotatable member adapted to be rotated a distance in proportion to the displacement of said element, a second rotatable member corresponding to the first member, a motion transmitting connection of the Geneva gear type connecting said members whereby for each cycle of rotation of said first member the sec ond member is rotated a fractional part of a revolution during the last increment of said first member, a third rotatable member cooperating with both of said members, motion transmitting means connecting the third member to said motor whereby said third member is driven in synchronism with the generation of pulses, one

pulse being transmitted for each increment of displacement of said element, said pulsing contacts being driven continuously while said third member is being rotated, means for connecting said pulsing contacts to said communicating medium upon movement of said first and second members from a base position to commence the sending of two series of pulses to the receiving station, one series to indicate the position of said second member and the other to indicate the position of said first member, and means for discontinuing the sending of one of the series of pulses when the third member passes through an angle corresponding to the position of the second member, means for terminating the other series of pulses when the third member passes through an angle corresponding to the position of the first member and means for locking the Geneva gear against rotation during transmission of the series of pulses, said means including a movable latch having two operating positions, in one of which it locks the Geneva gear against rotation, and in the other of which it permits rotation of the transfer gear, and cam means driven by said motor and adapted to move said latch to its first named position for operation of the apparatus to transmit pulses to indicate the positioning of the second and first members.

9. Telemetering apparatus as in claim 8 wherein said means for locking the Geneva transfer gear serves to prevent errors in reading greater than one increment.

l0. Telemetering apparatus as in claim 8 wherein said pulsing contacts are connected to said communicating medium during an open condition of said pulsing contacts.

11. Telemetering apparatus as in claim 8 together with means for causing simultaneous transmission of said series of pulses.

12. In telemetering transmitting apparatus of the type adapted to indicate the extent of displacement of an element from a base position by the use of pulses transmitted to a remote receiving station, said apparatus comprising pulsing contacts for transmitting electrical pulses to the receiving station, a motor for driving the pulsing contacts, circuit means for energizing the motor, a first rotatable member adapted to be rotated a distance in proportion to displacement of said element, a second rotatable member corresponding to the first member, a motion transmitting connection of the Geneva gear type connecting said members whereby for each cycle of rotation of said first member the second member is rotated a fractional part of a revolution during the last increment of said first member, a third rotatable member cooperating with both said members, motion transmitting means connecting the third member to the motor whereby said third member is driven in synchronism with the generation of the pulses, electrical contacts carried by the first and second members and positioned by the rotation of the same to indicate the angular position of each of said first and second members from a base point, contact means carried by said third member and adapted to engage the contacts on the first and second members, means controlled by engagement of the contacts carried by the third member with the contacts carried by the first and second members for effecting termination of transmission of pulses, means to effect transmission of one series of pulses to indicate the position of the second member and another series to indicate the position of the first member during a complete cyclic movement of said third member, and means for locking the second member against rotation during transmission of the pulses, said locking means including a cam driven by said electric motor.

13. In telemetering transmitting apparatus of the type adapted to indicate the extent of displacement of an element from a base position by the use of pulses transmitted to a remote receiving station, said apparatus comprising pulsing contacts for transmitting electrical pulses to the receiving station. a motor for driving the pulsing contacts, circuit means for energizing the motor, a first rotatable member adapted to be rotated a distance in proportion to displacement of said element, a second rotatable member corresponding to the first member, a motion transmitting connection of the Geneva gear type connecting said members whereby for each cycle of rotation of said first member the second member is rotated a fractional part of a revolution during the last increment of said first member, a third rotatable member cooperating with both said members, motion transmitting means connecting the third member to the motor whereby said third member is driven in synchronism with the generation of the pulses, electrical contacts carried by the first and second members and positioned by the rotation of the same to indicate the angular position of each of said first and second members from a base point, contact means carried by said third member and adapted to engage the contacts of the first and second members, means controlled by engagement of the contacts carried by the third member with the contacts carried by the first and second members for effecting termination of transmission of pulses, means to efiect transmission of one series of pulses to indicate the position of the second member and another series of pulses to indicate the position of the first member during a complete cyclic movement of said third member, and means for locking the Geneva transfer gear against rotation during transmission of a series of pulses, said means including a movable latch having two operating positions, one of which locks the Geneva transfer gear against rotation, and in the other of which permits rotation of the transfer gear, and cam mean-s driven by said motor and adapted to move said latch to its first named position before operation of the apparatus to transmit pulses to indicate the positioning of the second and first members.

14. In telemetering transmitting apparatus of the type adapted to indicate the extent of displacement of an element from a base position by the use of pulses transmitted to a remote receiving station, said apparatus comprising means adapted to be energized by a starting pulse, first and second movable members adapted to be moved a distance in proportion to the displacement of said element, means whereby displacement of said element moves the second member only a fractional part of the distance that the first member is moved, a third movable member adapted to move alongside said first and second members, motor means for moving said third member, means including a plurality of cams rotated by said motor means 111 synchronism with the movement of said third member, pulsing contacts operated by one of said cams, means operated by another of said cams for locking the second member against movement before transmission of said pulses, electrical pulses carried by the first and second members positioned by movement of the same to indicate the displacement of said first and second members from their base positions, contact means on said third member, means including relays connected to said pulsing contacts whereby upon movement of said third member there will be effected a transmission of a series of pulses to indicate the position of the first member and another series of pulses to indicate the position of said second member, and switch means connected to said relays and operated by another of said cams to de-energize' said apparatus at the end of the reading operation.

15. Telemetering apparatus as in claim 14 together with means for causing simultaneous transmission of the series of pulses.

l6. Telemetering apparatus as in claim 14 together with means for causing said pulsing contacts to transmit an identification code in the form of a series of pulses upon the energization of said apparatus.

17. Telemetering apparatus as in claim 16 together with means for causing sequential transmission of the series of pulses.

18. In telemetering transmitting apparatus of the type adapted to indicate the extent of displacement of an element item a base position by pulses transmitted to a remote receiving station, said apparatus comprising control means adapted to be energized by a starting pulse, pulsing 18 contacts for transmitting a series of electrical pulses to a receiving station, a motor for driving said pulsing contacts, circuit means connecting said motor to said control means whereby upon energization of said control means by said starting pulse said motor will be energized, a member adapted to be displaced a distance in proportion to the displacement of said element, another member cooperating with the first named member, motion transmitting means connecting the second member to said motor whereby said second member is driven in synchronism with the generation of pulses, circuitry including a relay for connecting the pulsing contacts to the receiving station, said relay including a pair of contacts connected in the circuitry connecting the pulsing contacts to the receiving station, said relay being energized upon energization of said control means to open said pair of contacts, switch means adapted to be operated by said motor to cause de-energization of said relay and closing of said pair of contacts to permit transmission of said electrical pulses to said receiving station, an electrical contact carried by the first named member and positioned by rotation of the same to indicate the position of the first named member, contact means carried by the second member and adapted to engage the contact on the first member to energize said relay and effect termination of the transmission of pulses.

19. Telemetering apparatus as in claim 18 wherein said switch means includes means to only permit operation of said switch means during an open condition of the pulsing contacts.

20. In telemetering apparatus of the type adapted to indicate the extent of displacement of an element from a base position by pulses transmitted to a remote receiving station, said apparatus comprising means including pulsing contacts for transmitting electrical pulses to the receiving station, a first member adapted to be rotated by an amount in proportion to the displacement of said ele ment, a second rotatable member, means forming a drive connection between said members whereby rotation of said first member through one complete revolution serves to advance the second member a fractional part of one revolution the angular displacement of points on each member from a base reference position serving to indi cate the displacement of said element in terms of coarse and fine units, a third member cooperating with the first and second members, motive means for driving the pulsing contacts and for rotating said third member to effect cyclic angular displacement of the same from a starting position through angles corresponding to the displacements of the first and second members from their base positions, means for connecting said pulsing contacts to the receiving station during an open condition of said pulsing contacts and upon movement of said first and second members from their base positions for initiation of transmission of series of pulses, and means disconnecting said pulsing contacts from the receiving station when the third member passes through angles corresponding to the positions of the first and second members for terminating transmission of the series of pulses.

21. Telemetering apparatus as in claim 20 together with means for locking the second member against rotation during transmission of the series of pulses, said locking means including a cam driven by said electric motor.

22. Telemetering apparatus as in claim 20 together with means for causing simultaneous transmission of said series of pulses.

References Cited in the file of this patent UNITED STATES PATENTS 1,955,043 Yates Apr. 17, 1934 2,116,372 Weld May 3, 1938 2,168,149 Arnold Aug. 1, 1939 2,192,421 Wallace Mar. 5, 1940 2,240,937 McNaney May 6, 1941 2,357,297 Wack et a1 Sept. 5, 1944 2,466,099 Hansen Apr. 5, 1949 

